<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
</head>
<body>

<input type="checkbox" name="" checked>

<script type="text/javascript" src="../jquery-3.2.1.js"></script>
<script type="text/javascript">

	//对于布尔类型的属性值不能用checked 用prop
	console.log($('input').attr('checked'))//checked

	console.log($('input').prop('checked')) //ture

	//设置为false
	$('input').prop('checked',false)
</script>

</body>
</html>